<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 200px;
            height: 200px;
        }

        .a {

            background-color: beige;
            float: left;
            margin-right: 10px;
        }

        .b {

            background-color: beige;
            float: left;
        }

        .c {
            width: 300px;
            height: 300px;
            background-color: rebeccapurple;
        }
    </style>
</head>

<body>
    <div class="a">111</div>
    <div class="b">111</div>
    <div class="c">jidsis</div>
</body>

</html>